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Consider a thin, 50 mm X 50 mm fuel cell similar to that of Example 1.5, with air in parallel flow over its surfaces. Very small-diameter wires are stretched across both sides of the fuel cell at a distance x = xc from the leading edge in order to trip the flow into tur- bulent conditions. Using an appropriate correlation from Chapter 7, determine the minimum velocity needed to sustain the fuel cell at Tc = 77°C, and the associated location of the wire. The air and large sur- roundings are at Too = Tsur = 27°C and the fuel cell dissipates Eg = 11 W. The fuel cell emissivity is s = 0.85.
Determine the maximum speed at which the car with mass can pass over the top point A of the vertical curved road and still maintain contact with the road.
a rocket has an initial mass of 25000 kg of which 20000 kg is fuel and oxygen. it is propelled directly upward from
problem 1a steel simple beam ab is supported by a copper wire at the middle point c. the beam is subjected to a pair of
neptune has equatorial diameter of 49532 km and mass 1.0247 x 1026 kg. if the planet is modeled as a homogeneous
an inventor claims to have devised a refrigeration cycle that at steady state requires a net power of .8 hp to remove
Air enters a turbine at 40 kN/m2, 900 C, and leaves at 10 kN/m2. The flow is reversible and adiabatic. Inlet velocity is quite low and outlet velocity is 150 m/s through a cross-sectional area of 0.20 m2. Calculate the power output in kW.
A large fraction of the thermal energy generated in the engine of a car is rejected to the air by the radiator through the circulating water. Should the radiator be analyzed as a closed system or as an open system? Explain.
air at 10 degc db and 5 degc wb is mixed with air at 25 degc db and 18 degc wb in a steady-flow process at standard
a secondary settling tank is to be designed for a municipal wastewater treatment facility. the influent tss is 1000 mgl
consider a piston-cylinder system containing 0.1 kg of water. initially the volume of the system is 0.0125 m3 while the
A pump is employed to deliver liquid water from a pond to a higher elevation. The pump steadily draws water from the pond at a volumetric flow rate of 192 gal/min through a pipe having a 7 in diameter inlet. The exit diameter of the pipe is 2 in. and..
Write a differential equation that could be used to determine pA(x, t) in the water. What does each term in the equation represent physically - Write appropriate boundary conditions that could be used to obtain a particular solution, assuming a "de..
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